Authors
Chao Shi, Mingliang Guo, Bin Hu, Maokai Yan, Zhimin Hou, Shanru Fang, Yuhan Li, Menghao Wang, Jie Miao, Junyi Cheng, Weifan Zu, Xunlian Fang, Ziyi Wang, Rongjuan Qin, Weidan Zhang, Xiaoping Niu, Yuan Qin
Published in
Plant, cell & environment. Oct 05, 2026. Epub Oct 05, 2026.
Abstract
Soil salinity severely limits rice productivity, yet the transcriptional mechanisms connecting salt stress with abscisic acid (ABA) signalling remain incompletely understood. Here, we identify the MYB-related transcription factors OsRVE1 and OsRVE2 as positive regulators of salinity tolerance in rice. Both genes were induced by salt and ABA, and simultaneous disruption of OsRVE1 and OsRVE2 caused pronounced salt hypersensitivity, whereas their overexpression enhanced salt tolerance, indicating partially redundant functions. Loss of OsRVE1/2 impaired ion and redox homoeostasis, stomatal regulation, and ABA responsiveness under salinity stress. Transcriptome analysis further revealed broad repression of stress- and ABA-responsive genes in the double mutant. OsRVE1 and OsRVE2 localised to the nucleus and functioned as transcriptional activators. Multiple molecular assays demonstrated that both proteins directly bind to the OsSAPK5 promoter and activate its expression. Importantly, ectopic expression of OsSAPK5 substantially restored salt tolerance in the osrve1; osrve2 mutant. Together, these findings establish an OsRVE1/OsRVE2-OsSAPK5 regulatory module that promotes rice salinity tolerance by reinforcing ABA-dependent stress responses.
PMID:
42832182
Bibliographic data and abstract were imported from PubMed on 06 Oct 2026.
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